. >>> president obama heading to vegas. he is betting on immigration reform. the president's going to highlight his proposals for overhauling immigration. in a speech three hours from now, it comes a day after the gang of eight, republican and democratic senators, outlined their plan. brianna keilar's got a preview of what we expect to hear from the president. >> reporter: in 2011 president obama went to the border town of el paso to press for comprehensive immigration reform. >> out of many, one. we define ourselves as a nation of immigrants. >> reporter: that went nowhere. now, in a second term, the president is trying it again, heading to las vegas today to push for border security, a verification system for employers to ensure they hire documented workers, with pun,ment if they don't and the most significant and controversial part of the president's plan, a pathway to citizenship for undocumented immigrants. it includes registering with the government, undergoing background checks, paying taxes and a penalty, and learning english. a solution eluded past pr